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J/MNRAS/463/3813    ASASSN-15oi UBVI M2W1W2 light curves     (Holoien+, 2016)

ASASSN-15oi: a rapidly evolving, luminous tidal disruption event at 216 Mpc. Holoien T.W.-S., Kochanek C.S., Prieto J.L., Grupe D., Chen P., Godoy-Rivera D., Stanek K.Z., Shappee B.J., Dong S., Brown J.S., Basu U., Beacom J.F., Bersier D., Brimacombe J., Carlson E.K., Falco E., Johnston E., Madore B.F., Pojmanski G., Seibert M. <Mon. Not. R. Astron. Soc., 463, 3813-3828 (2016)> =2016MNRAS.463.3813H (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, UBVRI Keywords: accretion, accretion discs - black hole physics - galaxies - nuclei Abstract: We present ground-based and Swift photometric and spectroscopic observations of the tidal disruption event (TDE) ASASSN-15oi, discovered at the centre of 2MASX J20390918-3045201 (d~=216Mpc) by the All-Sky Automated Survey for SuperNovae. The source peaked at a bolometric luminosity of L~=1.3x1044erg/s and radiated a total energy of E~=6.6x1050 erg over the first ∼3.5 months of observations. The early optical/UV emission of the source can be fit by a blackbody with temperature increasing from T~=2x104K to T~=4x104K while the luminosity declines from L~=1.3x1044erg/s to L~=2.3x1043erg/s, requiring the photosphere to be shrinking rapidly. The optical/UV luminosity decline during this period is most consistent with an exponential decline, L∝e-(t-t0)/tau_^, with τ~=46.5d for t0~=57241.6 (MJD), while a power-law decline of L∝(t-t0) with t0~=57212.3 and α=1.62 provides a moderately worse fit. ASASSN-15oi also exhibits roughly constant soft X-ray emission that is significantly weaker than the optical/UV emission. Spectra of the source show broad helium emission lines and strong blue continuum emission in early epochs, although these features fade rapidly and are not present ∼3 months after discovery. The early spectroscopic features and colour evolution of ASASSN-15oi are consistent with a TDE, but the rapid spectral evolution is unique among optically selected TDEs. Description: After the transient was classified as a TDE, we obtained a series of 26 Swift XRT and UVOT target-of-opportunity (ToO) observations. The UVOT observations were obtained in six filters: V (5468Å), B (4392Å), U (3465Å), UVW1 (2600Å), UVM2 (2246Å), and UVW2 (1928Å) We also obtained BVI images with the Las Cumbres Observatory Global Telescope Network (LCOGT; Brown et al. 2013) 1-m telescopes at Siding Spring, South African Astronomical, and Cerro Tololo Inter-America Observatories. Objects: -------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------- 20 39 09.10 -30 45 20.7 ASASSN-15oi = ASASSN -15oi -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 30 241 Photometric data of ASASSN-15oi
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 9 F9.3 d MJD Observation date (MJD) 11- 15 F5.2 mag mag Magnitude in Filter (Vega) (1) 17- 21 F5.3 mag e_mag rms uncertainty on mag (Vega) (1) 23- 24 A2 --- Filt [UBVI M2 W1 W2] Filter 26- 30 A5 --- Tel [LCOGT Swift] Telescope
Note (1): Data are not corrected for Galactic extinction.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 14-May-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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